EP1172809A4 - Optical disk device - Google Patents

Optical disk device

Info

Publication number
EP1172809A4
EP1172809A4 EP01906172A EP01906172A EP1172809A4 EP 1172809 A4 EP1172809 A4 EP 1172809A4 EP 01906172 A EP01906172 A EP 01906172A EP 01906172 A EP01906172 A EP 01906172A EP 1172809 A4 EP1172809 A4 EP 1172809A4
Authority
EP
European Patent Office
Prior art keywords
light beams
phase differences
optical fibers
optical disk
polarization preserving
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP01906172A
Other languages
German (de)
French (fr)
Other versions
EP1172809A1 (en
Inventor
Kazuyoshi Horie
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sony Corp
Original Assignee
Sony Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Sony Corp filed Critical Sony Corp
Publication of EP1172809A1 publication Critical patent/EP1172809A1/en
Publication of EP1172809A4 publication Critical patent/EP1172809A4/en
Withdrawn legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B11/00—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor
    • G11B11/10—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor using recording by magnetic means or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field
    • G11B11/105—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor using recording by magnetic means or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field using a beam of light or a magnetic field for recording by change of magnetisation and a beam of light for reproducing, i.e. magneto-optical, e.g. light-induced thermomagnetic recording, spin magnetisation recording, Kerr or Faraday effect reproducing
    • G11B11/1055—Disposition or mounting of transducers relative to record carriers
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B11/00—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor
    • G11B11/10—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor using recording by magnetic means or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field
    • G11B11/105—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor using recording by magnetic means or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field using a beam of light or a magnetic field for recording by change of magnetisation and a beam of light for reproducing, i.e. magneto-optical, e.g. light-induced thermomagnetic recording, spin magnetisation recording, Kerr or Faraday effect reproducing
    • G11B11/10532—Heads
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B11/00—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor
    • G11B11/10—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor using recording by magnetic means or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field
    • G11B11/105—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor using recording by magnetic means or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field using a beam of light or a magnetic field for recording by change of magnetisation and a beam of light for reproducing, i.e. magneto-optical, e.g. light-induced thermomagnetic recording, spin magnetisation recording, Kerr or Faraday effect reproducing
    • G11B11/10532—Heads
    • G11B11/10541—Heads for reproducing
    • G11B11/10543—Heads for reproducing using optical beam of radiation
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/08—Disposition or mounting of heads or light sources relatively to record carriers
    • G11B7/085—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam into, or out of, its operative position or across tracks, otherwise than during the transducing operation, e.g. for adjustment or preliminary positioning or track change or selection
    • G11B7/08547—Arrangements for positioning the light beam only without moving the head, e.g. using static electro-optical elements
    • G11B7/08564—Arrangements for positioning the light beam only without moving the head, e.g. using static electro-optical elements using galvanomirrors
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/12—Heads, e.g. forming of the optical beam spot or modulation of the optical beam
    • G11B7/135—Means for guiding the beam from the source to the record carrier or from the record carrier to the detector
    • G11B7/1356—Double or multiple prisms, i.e. having two or more prisms in cooperation
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/12—Heads, e.g. forming of the optical beam spot or modulation of the optical beam
    • G11B7/135—Means for guiding the beam from the source to the record carrier or from the record carrier to the detector
    • G11B7/1365—Separate or integrated refractive elements, e.g. wave plates
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/12—Heads, e.g. forming of the optical beam spot or modulation of the optical beam
    • G11B7/135—Means for guiding the beam from the source to the record carrier or from the record carrier to the detector
    • G11B7/1372—Lenses
    • G11B7/1374—Objective lenses
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/12—Heads, e.g. forming of the optical beam spot or modulation of the optical beam
    • G11B7/135—Means for guiding the beam from the source to the record carrier or from the record carrier to the detector
    • G11B7/1384—Fibre optics
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B2220/00—Record carriers by type
    • G11B2220/20—Disc-shaped record carriers
    • G11B2220/25—Disc-shaped record carriers characterised in that the disc is based on a specific recording technology
    • G11B2220/2525—Magneto-optical [MO] discs

Landscapes

  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Optical Head (AREA)

Abstract

Light beams emitted from a light source (11) and returned light beams reflected off magneto-optical disks (7a), (7b), (7c), (7d) are transmitted by using polarization preserving optical fibers (15a), (15b), (15c), (15d). Phase difference generating means (16a), (16b), (16c), (16d) are disposed in the optical paths of the light beams, and the phase differences of electric field vibration components occurring in the light beams due to double refraction of polarization preserving optical fibers (15a), (15b), (15c). (15d) are offset by phase differences produced by phase difference producing means (16a), (16b), (16b), (16c), (16d), or the phase differences are adjusted to be multiples of π.
EP01906172A 2000-02-21 2001-02-21 Optical disk device Withdrawn EP1172809A4 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP2000048982A JP2001236682A (en) 2000-02-21 2000-02-21 Optical disk device
JP2000048982 2000-02-21
PCT/JP2001/001257 WO2001061691A1 (en) 2000-02-21 2001-02-21 Optical disk device

Publications (2)

Publication Number Publication Date
EP1172809A1 EP1172809A1 (en) 2002-01-16
EP1172809A4 true EP1172809A4 (en) 2005-01-12

Family

ID=18570982

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01906172A Withdrawn EP1172809A4 (en) 2000-02-21 2001-02-21 Optical disk device

Country Status (6)

Country Link
US (1) US6700855B2 (en)
EP (1) EP1172809A4 (en)
JP (1) JP2001236682A (en)
KR (1) KR100750625B1 (en)
CN (1) CN1172302C (en)
WO (1) WO2001061691A1 (en)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004325859A (en) * 2003-04-25 2004-11-18 Hitachi Printing Solutions Ltd Optical recorder
EP1585119A1 (en) * 2004-04-06 2005-10-12 Deutsche Thomson-Brandt Gmbh Device for reading and /or writing optical recording media
TWI256633B (en) * 2004-08-20 2006-06-11 Asustek Comp Inc Optical component set used in pick up head
US7400448B2 (en) * 2004-11-19 2008-07-15 Optical Physics Company Birefringent spectral filter
US7557820B2 (en) * 2005-03-16 2009-07-07 Kabushiki Kaisha Toshiba Optical multi-beam scanning device and image forming apparatus
JP2008130106A (en) * 2006-11-16 2008-06-05 Hitachi Ltd Thermally assisted magnetic recording head support mechanism

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5152597A (en) * 1990-12-03 1992-10-06 Eastman Kodak Company Magneto-optic readout using a polarization-preserving optical fiber
US5218582A (en) * 1990-12-03 1993-06-08 Eastman Kodak Company Magneto-optic readout using a polarization-preserving optical guide
US5245491A (en) * 1989-06-02 1993-09-14 Hitachi Cable Limited Magneto-optical head employing optical fiber connected stationary and movable portions
US5446813A (en) * 1994-08-08 1995-08-29 Industrial Technology Research Institute Optical isolator
WO1998009392A2 (en) * 1996-08-27 1998-03-05 Quinta Corporation System and method of using optical fibers in a data storage and retrieval system
WO1999050842A1 (en) * 1998-03-30 1999-10-07 Seagate Technology, Llc. Low-birefringence optical fiber for use in an optical data storage system

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5956236A (en) 1982-09-22 1984-03-31 Canon Inc Optical head
JPS61118121A (en) 1984-11-12 1986-06-05 Mitsubishi Heavy Ind Ltd Stirrer
JPS61118121U (en) * 1984-12-28 1986-07-25
JPS62259239A (en) 1986-05-06 1987-11-11 Hitachi Ltd Laminated optical disk device
JP3412840B2 (en) 1992-07-17 2003-06-03 科学技術振興事業団 Ultra-high resolution writing / reading method and apparatus for optical recording medium
JPH07128073A (en) 1993-11-09 1995-05-19 Japan Aviation Electron Ind Ltd Optical fiber gyro
US6034938A (en) * 1996-07-30 2000-03-07 Seagate Technology, Inc. Data storage system having an optical processing flying head
JPH11162033A (en) * 1997-11-28 1999-06-18 Comets:Kk Magneto-optical recording/reproducing device
JPH11162933A (en) 1997-12-02 1999-06-18 Fujitsu Ltd Manufacture of semiconductor device
JPH11219537A (en) 1998-02-02 1999-08-10 Olympus Optical Co Ltd Optical pickup
US6587421B1 (en) * 1998-03-30 2003-07-01 Seagate Technology Llc Refractive index matching means coupled to an optical fiber for eliminating spurious light
JP2000067458A (en) * 1998-08-24 2000-03-03 Sony Corp Optical disk device

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5245491A (en) * 1989-06-02 1993-09-14 Hitachi Cable Limited Magneto-optical head employing optical fiber connected stationary and movable portions
US5152597A (en) * 1990-12-03 1992-10-06 Eastman Kodak Company Magneto-optic readout using a polarization-preserving optical fiber
US5218582A (en) * 1990-12-03 1993-06-08 Eastman Kodak Company Magneto-optic readout using a polarization-preserving optical guide
US5446813A (en) * 1994-08-08 1995-08-29 Industrial Technology Research Institute Optical isolator
WO1998009392A2 (en) * 1996-08-27 1998-03-05 Quinta Corporation System and method of using optical fibers in a data storage and retrieval system
WO1999050842A1 (en) * 1998-03-30 1999-10-07 Seagate Technology, Llc. Low-birefringence optical fiber for use in an optical data storage system

Also Published As

Publication number Publication date
JP2001236682A (en) 2001-08-31
US6700855B2 (en) 2004-03-02
KR20010112437A (en) 2001-12-20
CN1172302C (en) 2004-10-20
US20020136149A1 (en) 2002-09-26
CN1363089A (en) 2002-08-07
WO2001061691A1 (en) 2001-08-23
KR100750625B1 (en) 2007-08-20
EP1172809A1 (en) 2002-01-16

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Effective date: 20060808